Low voltage differential signaling driver with programmable on-chip resistor termination

A device, comprising:

• a low voltage differential signaling driver, wherein the low voltage differential signaling driver comprises:
• a current steering output circuit having a first driver output and a second driver output;
• a programmable on-chip resistor, wherein the programmable on-chip resistor is selectively operable to act as a termination resistor and control an output swing of the driver by countering a variation in a drive current;
• an on-chip reference resistor, substantially similar to the programmable on-chip resistor, driven by a band gap or reference voltage operable to generate reference bias current;
• and
• a common mode feedback circuit connected to the first driver output and the second driver output, wherein the common mode feedback circuit is operable to selectively control the drive current.

A device, comprising:

• a low voltage differential signaling driver, wherein the low voltage differential signaling driver comprises:
• a current steering output means having a first driver output and a second driver output;
• a programmable on-chip resistor means, wherein the programmable on-chip resistor means is selectively operable to act as a termination resistor and control an output swing of the driver by countering a variation in a drive current;
• an on-chip reference resistor, substantially similar to the programmable on-chip resistor, driven by a band gap or reference voltage operable to generate reference bias current;
• and
• a common mode feedback means connected to the first driver output and the second driver output, wherein the common mode feedback means is operable to selectively control the drive current.

A method of converting a complementary metal oxide semiconductor input voltage signal to a differential low voltage signal for off-chip transmission, comprising:

• receiving a complementary metal oxide semiconductor input voltage signal at a low voltage differential signaling driver;
• converting the complementary metal-oxide semiconductor input voltage signal to a differential output voltage;
• switching the low voltage differential signaling driver to a first circuit configuration or a second circuit configuration;
• selectively controlling a programmable on-chip resistor on the low voltage differential signaling driver in order to control a driver output swing by countering a variation in a drive current and to provide an on-chip termination resistor;
• generating a reference bias current by an on-chip reference resistor, substantially similar to the programmable on-chip resistor, driven by a band gap or reference voltage;
• and
• sensing a common mode output voltage;
• comparing the common mode output voltage to the reference voltage;
• and
• adjusting the drive current when the common mode output voltage is not equal to the reference voltage.

A device, comprising:

• means for receiving a complementary metal oxide semiconductor input voltage signal at a low voltage differential signaling driver;
• means for converting the complementary metal-oxide semiconductor input voltage signal to a differential output voltage;
• means for switching the low voltage differential signaling driver to a first circuit configuration or a second circuit configuration;
• means for selectively controlling a programmable on-chip resistor on the low voltage differential signaling driver in order to control a driver output swing by countering a variation in a drive current and to provide an on-chip termination resistor;
• means for generating a reference bias current by an on-chip reference resistor, substantially similar to the programmable on-chip resistor, driven by a band gap or reference voltage;
• and
• means for sensing a common mode output voltage;
• means for comparing the common mode output voltage to the reference voltage;
• and
• means for adjusting the drive current when the common mode output voltage is not equal to the reference voltage.

A device, the device comprising:

• logic for receiving a complementary metal oxide semiconductor input voltage signal at a low voltage differential signaling driver;
• logic for converting the complementary metal-oxide semiconductor input voltage signal to a differential output voltage,
• logic for switching the low voltage differential signaling driver to a first circuit configuration or a second circuit configuration;
• logic for selectively controlling a programmable on-chip resistor on the low voltage differential signaling driver in order to control a driver output swing by countering a variation in a drive current and selectively provide an on-chip termination resistor;
• logic for generating a reference bias current by an on-chip reference resistor, substantially similar to the programmable on-chip resistor, driven by a band gap or reference voltage;
• and
• logic for sensing a common mode output voltage;
• logic for comparing the common mode output voltage to the reference voltage;
• and
• logic for adjusting the drive current when the common mode output voltage is not equal to the reference voltage.